Air-preheating device for furnaces and the like



Dec. 25. 1923. 1,478,732

H. R. BRUNNER AIR PREHEA'I'ING DEVICE FOR FURNACES AND THE LIKE E gOriginal Filed Oct. '7 191.5 r I fi /215 2313? a 33 a 9 00 a! 5 gig Patented Dec. 25, 1923.

OF NEW JERSEY.

\ 1 1,478,732 PATENT OFFICE.

HERBERT R. BRUNNER, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, T VAN KANNEL REVOLVING DOOR COMPANY, OF NEW YORK, N. Y-, A. CORPORATION" AlBI-PREHEATING DEVICE FOR FURNACES AND THE LIKE.

Original application filed October 7,

quantity to the combustion space of a stove or furnace, to promote combustion therein.

The particular object of the present invention is to provide adevice of this character which isrelatively shallow; that is to say one which does not extend far back from that it may be advantageously used in fur naces which have relatively shallow fire boxes.

The present application is a division of my previous application Serial Number 54,631, filed October 7, 1915, which eventuated in Patent Number 1,354,950 dated October 5, 1920. p

The present structure embodies the advantageous features of an entrance chamber provided with baffles, a heating chamber provided with channels or passages and with sharp reversals of direction to exercise a control of air passing through the appliance independent of any dampers or similar controlling devices within the preheater itself, so that the amount of air is regulated in accordance with the draft requirements of the furnace. The present invention also includes a suitable discharge passage or chamber and suitable discharge orifices.

The general principles of construction and proportions of passages to bring about the desired results are fully discussed in the above mentioned application.

The present invention in distinction from the structure claimed in the above mentioned application, provides a very compact and horizontally shallow structure, which extends only moderately back into the fire space and is thereforenot liable to be burned out by too close contact with the flame.

The accompanying drawing illustrates one the furnace door to which it is attached, so

embodiment of the invention; After considering this, in connection with the descripunderstand how the invention may be embodied in other forms, and I do not limit myself, except as to claims.

F lgure 1 is 'a central sectionof an appliance embodying the invention in place on the 'ance removed from the door; 1

Figure 3 is a horizontal section at 00 of Figure 2. v

Figure 1 is a vertical section at p-p, Figure 3. t

Figure 5 is a similar section at g g, Figure 3. 1

' Figure 6 is ure 3. v a The major part of the appliance is preferably a single castinghaving an open front as clearly set forth in Figures 1 and 2. Around the periphery of the front are placed pivoted ears 5, by means of which the appliance may be secured to the rear of a. furnace door 7, Figure 1. When in this position. the adjustable damper D conducts atmospheric air directly to the open front of the preheater. The front inner wall 181 of the appliance, together with its bottom and side flange 181', 181 are conveniently and preferably made separate from the rest of the structure and loosely positioned and when so positioned are retained by the securing of the appliance to the furnace door. The body of the appliance is in the form of an approximately rectangular box having outer walls 17 7. Rearward of the front removable wall 181, are located integral vertical partitions 178, 179 and 180, which, together with the front removable bafiie plate 181, and rear casing wall 182, form aseries of compartments 183, 184:, 185 and 186, and within these compartments are arranged a series of horizontal bafiie walls 187, provided with passages at their alternate ends, so that the air, in its travel, will pass back and forth in each compartment. The various compartments are in intercommunication by means of openings in the vertical partitions. The partition 178 has inlet opening 188, at the bottom, to one side, through which the air is a similar section at /'4 Figs 1 1915, Serial No. 54,631. Divided and this application filed December" 12, 1919. Serial No. 3%,342.

.tion, those persons skilled in the art will...

admitted to compartment 184. The air passes J air passes back and forth i-ncompartment 185, and is admitted to compartment 186,

through opening 190 which is in the partition 180. As shown best in Figures 5 and 6, V

the opening 190 is above the opening 188, in partition 178, due to the formation of the rear partof the casing, there being an offset 191 in the rear Wall of said casing, which offset is provided for the purpose of protect} ing the lower edge of the casing from the too direct efi'ect of the heat from the furnace, the offset forming an air cushion, which protectsthe' lower rear edge of the element. When the thoroughly heated air reaches the upper rear passage or channel 200, it is discharged into the combustion space through apertures or nozzles 24.

Thecross Sectional area of the air channel 7 or passage, and its length, together with the number of reversals of direction are such that while a proper amount of adequately preheated air is furnished under low draft conditions, the frictional resistance of the oassa es under hi h draft conditions er- 1. b i v 7 mits an adequately increased amount of air to be separated to properly support the combustion, but prevents an excess amount of air and also prevents inadequately heated air, from being supplied to the fire box. In

otherwords', the structure represents one embodiment of a preheating device in which the air passages conform to the law of the flow of gases explained in my previous application, above identified.

Having thus fully described my invention, what I claim is V 'In' a preheater for stoves and furnaces,

the combination of a substantially boxshaped casting having an open front, a detachable front partition located in the front portion of the structure, the rear portion of the structure being provided with horizontal and vertical flanges provided with communicating openings defining a long tortuous heating passage of relatively small-cross section, in which air in adjacent branches of the passage moves in opposite directions, the compartmentconstituting the terminal part of the passage being located at the rear of the structure and being provided with a plurality ofdischarge nozzlesin the rear wall, the lower rear portion of the structure being recessed toremove it from proximity to the fire, the communicating aperture in the rearmost inner vertical partition beinglocated above the level of the communicating aperture in the frontfixed vertical partition.

Intestimony'whereof I aflix my signature inpresence of two witnesses; V

HERBERT R. BRUNNER;

Witnesses:

7 H. C. STINNER,

J. F. BLArIoHARo. 

